Allow a user to show or block non friends from seeing comments.
That would just be a waste of bandwidth, because there would be no point to implement this if there's already a private messaging system.
Allow a user to delete a large amount of comments with one action.
Hopefully they will have this added, and those who were spammed by the pagelength wouldn't have to wait for mods to do it; or just do it themselves, which could take hours, depending on whether or not you get redirected to your profile every time you delete a comment.
